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For the curve x^(2)+4xy+8y^(2)=64, the t...

For the curve `x^(2)+4xy+8y^(2)=64`, the tangents are parallel to the x-axis only at the points-

A

`(0,2sqrt(2))` and `(0,-2sqrt(2))`

B

`(8,-4)` and `(-8,4)`

C

`(8sqrt(2),-2sqrt(2))` and `(-8sqrt(2),2sqrt(2))`

D

`(8,0)` and `(-8,0)`

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